“[I love] watching him develop into a little boy,” he shared. “Sitting up, holding a bottle or cruising around in his walker. You don’t think it’s a big deal until you see your kid doing it.”

The Safe Haven star says that Fergie loves to sing to their baby boy.

“Right now, at this very moment, she is singing Avicii to Axl,” he shared. “He loves it. I tried doing the same thing the other day and he just puked.”

The first-time dad also revealed that he and the Black Eyed Peas frontwoman, 39, want a big brood. “I’m ready whenever it happens,” he said. “I’m always at the ready. We’d like 16.”

Watch for Josh to light up the big screen in a few flicks due this year, including You’re Not You with Emmy Rossum, Strings with Maria Bello and Laura Dern, and Lost in the Sun costarring Josh Wiggins. He also recently worked on a pilot for a TV series, Battle Creek.